I know the m3s came with knock sensors but earlier m50s didn't. For FI it is probably a good idea to have one. How feasable is it to retroffit one? After all, all it is is a microphone that listens for a specific fingerprint.
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I know the m3s came with knock sensors but earlier m50s didn't. For FI it is probably a good idea to have one. How feasable is it to retroffit one? After all, all it is is a microphone that listens for a specific fingerprint.
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Yeah I'm interested in a J&S Active Sensor, but I have no idea where to start.

Hmm...but that is a complete new ignition system. Don't know how well that would play with BOSCH ecu. Instead of retarding the timing I think a better course of action would be to dump a tad more fuel into cylinders to cool them down.

I know the m3s came with knock sensors but earlier m50s didn't. For FI it is probably a good idea to have one. How feasable is it to retroffit one? After all, all it is is a microphone that listens for a specific fingerprint.
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The non-vanos ecu is not able to support knock sensors from the 93-up cars. You would need an aftermarket unit.

The non-vanos ecu is not able to support knock sensors from the 93-up cars. You would need an aftermarket unit.
or you could swap wiring harness/ecu with a 93-95 M50TU powered car and start from there.

or you could swap wiring harness/ecu with a 93-95 M50TU powered car and start from there.

To perform this swap, what else would be needed or how hard would it be. The non-vanos ecu is harder to tune I've often heard, and if a 413 could be swapped in then the perfect tune could be possible I imagine.

To perform this swap, what else would be needed or how hard would it be. The non-vanos ecu is harder to tune I've often heard, and if a 413 could be swapped in then the perfect tune could be possible I imagine.
you'd need the wiring harness, MAF, knock sensors, and ECU. I think the rest of the sensors are the same.

you'd need the wiring harness, MAF, knock sensors, and ECU. I think the rest of the sensors are the same.

And wider tires for more contact patch.:stickoutt

And wider tires for more contact patch.:stickoutt
:nutz:

OK but are there any seperate units out there that can listen for a knock? Once it's found its probably pretty easy to rich the mixture for the time being. The 413 ecu would be an obvious choice but the idea here is to do it on a budget.

To perform this swap, what else would be needed or how hard would it be. The non-vanos ecu is harder to tune I've often heard, and if a 413 could be swapped in then the perfect tune could be possible I imagine.
The non-vanos are easier to tune(less variables)!!!

you'd need the wiring harness, MAF, knock sensors, and ECU. I think the rest of the sensors are the same.
And …..? What are you going do with VANOS???

And …..? What are you going do with VANOS???
Do nothing with vanos. It doesn't have it. so there's one wire you don't plug in. no biggie. People turn OFF vanos all the time.

In the software, what to do there is trivial. Off the top of my head you could:
1. set the vanos on and vanos off tables to be the same
2. set the pointers to those tables to just one set of tables
3. set the vanos table such that it only uses the vanos off tables.
4. set the vanos table such that it only uses the vanos on tables.
5. you could even set the vanos start point such that the secondary tables are your first part of a soft touch rev limiter. (ooh, now there's a hot idea.) if your redline is 7000, set the vanos switch point as 6900, and the other ignition tables can be very retarded.